Sage 50 Accounts

Hi, I need to amend and reprint an old sales invoice on sage 50 cloud, but the invoice is not currently showing on the 'Invoices and credits' tab, I can only see it in the 'customer activity'. Any idea how I can do this?

For example the code for entertaining. Everytime it’s used in batch invoices, cold if never add vat? When a invoice uses the a specific nominal code, is it possible that the code never adds vat.